.item li {
    list-style: none;
    width: 590px;
    height: 340px;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    transition: opacity 300ms ease-in-out 0s;
}

img {
    width: 100%;
    height: 100%;
}

.leftBtn {
    position: absolute;
    left: 0;
    top: 0;
}

.rightBtn {
    position: absolute;
    right: 0;
    top: 0;
}

div {
    position: relative;
    width: 590px;
    height: 340px;
}

.page {
    position: absolute;
    bottom: 50px;
    left: 200px;
    height: 30px;
    /*width: 300px;*/
}

.page li {
    float: left;
    width: 30px;
    height: 30px;
    list-style: none;
    background: red;
    border-radius: 50%;
    line-height: 30px;
    text-align: center;
}